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vhost-scsi: Add VMState descriptor
As preparation of enabling migration of vhost-scsi device, define it’s VMState. Note, we keep the convention of verifying in the pre_save() method that the vhost backend must be stopped before attempting to save the device state. Similar to how it is done for vhost-vsock. Reviewed-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com> Reviewed-by: Liran Alon <liran.alon@oracle.com> Signed-off-by: Nir Weiner <nir.weiner@oracle.com> Message-Id: <20190416125912.44001-3-liran.alon@oracle.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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@ -139,6 +139,28 @@ static void vhost_dummy_handle_output(VirtIODevice *vdev, VirtQueue *vq)
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{
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}
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static int vhost_scsi_pre_save(void *opaque)
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{
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VHostSCSICommon *vsc = opaque;
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/* At this point, backend must be stopped, otherwise
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* it might keep writing to memory. */
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assert(!vsc->dev.started);
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return 0;
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}
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static const VMStateDescription vmstate_virtio_vhost_scsi = {
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.name = "virtio-vhost_scsi",
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.minimum_version_id = 1,
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.version_id = 1,
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.fields = (VMStateField[]) {
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VMSTATE_VIRTIO_DEVICE,
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VMSTATE_END_OF_LIST()
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},
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.pre_save = vhost_scsi_pre_save,
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};
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static void vhost_scsi_realize(DeviceState *dev, Error **errp)
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{
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VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev);
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@ -256,6 +278,7 @@ static void vhost_scsi_class_init(ObjectClass *klass, void *data)
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FWPathProviderClass *fwc = FW_PATH_PROVIDER_CLASS(klass);
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dc->props = vhost_scsi_properties;
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dc->vmsd = &vmstate_virtio_vhost_scsi;
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set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
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vdc->realize = vhost_scsi_realize;
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vdc->unrealize = vhost_scsi_unrealize;
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